From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Spinlocks and compiler/memory barriers |
Date: | 2014-07-01 20:54:35 |
Message-ID: | 20734.1404248075@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> Despite my concerns about keeping the list of supported atomics short,
> and I do have concerns in that area, I'm not really sure that we have
> much choice but to go in that direction. We can't accept a >5x
> performance hit in the name of portability, and that's literally what
> we're talking about in some cases. I definitely want to think
> carefully about how we proceed in this area but doing nothing doesn't
> seem like an option.
To be clear, I'm not advocating doing nothing (and I don't think anyone
else is). It's obvious based on Andres' results that we want to use
atomics on platforms where they're well-supported. The argument is
around what we're going to do for other platforms.
regards, tom lane
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